The black diamond, with its bold dark tone, represents strength. When you need to display your strength and boldness, this is the piece that you will turn to. Placed in a prong setting, these genuine diamonds are sure to achieve amazing sparkle, even in dim light. At 3mm (or 4mm in the 14G barbell for navel piercings), the diamonds are the perfect size for your rook, eyebrow, or other suitable piercings. Genuine Diamonds 0.20 cwt.. -3mm diamonds for 18G & 16G barbell 0.50 cwt..- 4mm diamonds for 14G barbell Solid 14k gold Hypo-allergenic / nickel-free Internally threaded barbell Available in yellow, white, and rose gold Choose from several gauges and lengths to suit a variety of different piercings Custom made to order Custom sizesavailable upon request Handmade in the USA